CN104655808B - A kind of Fracture with low permeability oil reservoir imbibition oil recovery experimental technique - Google Patents
A kind of Fracture with low permeability oil reservoir imbibition oil recovery experimental technique Download PDFInfo
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- CN104655808B CN104655808B CN201510114940.8A CN201510114940A CN104655808B CN 104655808 B CN104655808 B CN 104655808B CN 201510114940 A CN201510114940 A CN 201510114940A CN 104655808 B CN104655808 B CN 104655808B
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Abstract
The present invention relates to a kind of Fracture with low permeability oil reservoir imbibition oil recovery experimental technique.Mainly solve existing dynamic imbibition experiment research and be difficult to accurately reflect each factor problem on the impact of dynamic imbibition oil recovery process in experiment.It is characterized in that: comprise the following steps: (1) mould；(2) dispensing；(3) sand cutting；(4) the most die-filling and pressurization；(5) paving template interlayer；(6) secondary is die-filling and pressurizes；(7) heat；(8) coring；(9) evacuation saturation water；(10) saturated in-place oil；(11) dynamically imbibition experiment: removal of core, remove the adhesive tape of rock core intermediate plastic film and winding, subsequently by rock core circular arc appearance and two end faces with resealing, inject water and oil displacement agent along crack by rock core, use the method simulation fracture oil reservoir imbibition oil recovery process.This low-permeability fissured oil reservoir imbibition oil recovery process experimental technique, it is possible to ensure that substrate core oil saturation is not affected by crack, simplify the operating procedure of existing experimental technique, improve the precision of dynamic imbibition experiment.
Description
Technical field:
The present invention relates to oil reservoir development technical field, especially a kind of for low permeability fractured oil
The Fracture with low permeability oil reservoir imbibition hiding dynamic imbibition oil recovery effect and Study on influencing factors thereof is recovered the oil
Experimental technique.
Background technology:
Low-permeability fissured oil reservoir exploitation often occurring, waterflood is serious and moisture content rises fast
The problem that the waterflood recovery efficiency factor that causes is relatively low.Current desk research and field test have shown that can
The friendship seepage flow realizing injecting between water and oil reservoir host rock by cyclic water stimulation oil recovery technique moves,
Thus reduce substrate core oil saturation, improve crude oil recovery percent of reserves.Along with oil field section skilled worker
The understanding of low-permeability fissured oil reservoir is constantly deepened by author, it has been suggested that fine optimization water filling
The parameters of huff and puff oil recovery technology, to strengthen dynamic imbibition oil recovery effect between crack and substrate.
Owing to field practice needs Related Experimental Study to provide fundamental basis, dynamically ooze so carrying out indoor
Parameters is optimized and is extremely necessary by suction oil recovery experimentation.At present, dynamically ooze
Suction oil recovery experimentation key step: first saturated to rock core formation water and in-place oil, then
Rock core cutting made seam or uses three axial rock mechanics instrument applying external force to make seam, finally carrying out dynamic
State imbibition is tested.But, all there is troublesome poeration, fracture pattern and geometry in above-mentioned seam method of making
Size Control difficulty, the rock core substrate oil saturation technical barrier such as impacted during making seam
And it cannot be guaranteed that every batch to make the seam fracture pattern of rock core, position identical, thus cause experiment to grind
The impact on dynamic imbibition oil recovery process of each factor cannot be accurately reflected in studying carefully.
Summary of the invention:
The invention reside in and overcome existing dynamic imbibition experiment research present in background technology
It is difficult to accurately reflect each factor problem on the impact of dynamic imbibition oil recovery process in experiment, and carries
For a kind of low-permeability fissured oil reservoir imbibition oil recovery process experimental technique.This low permeability fractured oil
Hide imbibition oil recovery process experimental technique, it is possible to ensure that substrate core oil saturation is not by crack shadow
Ring, simplify the operating procedure of existing experimental technique, improve the precision of dynamic imbibition experiment.
The present invention solves its problem and can reach by following technical solution: this low permeability fractured
Oil reservoir imbibition oil recovery process experimental technique, comprises the following steps:
(1) mould: mould is formed square dies by side plate, end plate, base plate and pressing plate；
(2) dispensing: rock core makes material and is made up of quartz sand and cement, quartz sand and glue
Knot thing components by weight percentage: quartz sand 85%～95%, cement 5%～15%；
(3) sand cutting: according to core permeability, after quartz sand stirs, will prepare cementing
Needed for thing, medicine weighs the most respectively, pours in quartz sand after mixing, stirs, sieves；
(4) the most die-filling and pressurization: with acetone, die inside is cleaned, the sand one that will mix
Half loads in mould, moves back and forth in the horizontal direction in mould with stragith edge subsequently, this
Between also need constantly to adjust the stragith edge degree of depth, until sand is uniformly distributed, finally by pressure
Sand is compacted by plate, is placed on pressure testing machine by the mould loaded, and adjusts die location,
Keep it on forcing press bearing plate centrage, the most slowly boost to design load, surely
Pressure 15min, release；
(5) paving template interlayer: the template of design thickness is laid in the rock core pressed
On；
(6) secondary is die-filling and pressurizes: in second half loading mould of the sand that will mix, with scraping
Sand plate constantly adjusts the stragith edge degree of depth until sand is uniformly distributed, with pressing plate by sand pressure
Real, finally the mould loaded is placed on pressure testing machine, adjusts die location, make
It is maintained on forcing press bearing plate centrage, the most slowly boosts to design load, voltage stabilizing
15min, release；
(7) heat: will compacting after rock core put into baking oven, under the conditions of 85 DEG C constant temperature 6～
8h solidifies；
(8) coring: first bulk rock core is cut, subsequently according to design rock core length
From side with template for center line coring, obtain diameter 2.5cm column rock core, by column
In the middle of rock core, clamping template takes off, and obtains 2 symmetrical semicolumn rock cores, after merging
To man-made fracture rock core；
(9) evacuation saturation water: rock core claims dry weight, evacuates saturation experiments water, treats saturation water
After completing, wipe out core surface water droplet with reagent paper, weigh rock core weight in wet base and calculate hole
Degree；
(10) saturated in-place oil: with politef unsintered tape by 2 semicolumn rock cores
Side seals, and reserves 2 semicolumn rock core side end, is then merged and be placed on
In core holding unit, adding confined pressure, saturated in-place oil also calculates oil saturation, aging
24h；Isolate with plastic sheeting in the middle of 2 semicolumn rock core sides；
(11) dynamically imbibition experiment: removal of core from core holding unit, removes in rock core
Between plastic sheeting and the politef unsintered tape of winding, subsequently by rock core circular arc appearance
Reseal with two end faces politef unsintered tape again, only expose column rock core and split
Stitch two sides, inject water and oil displacement agent along crack by rock core, use the method simulation
Fractured reservoir imbibition oil recovery process, and carry out imbibition oil recovery effect and influence factor grinds
Study carefully.
The present invention can have the advantages that compared with above-mentioned background technology this is hypotonic
Fractured reservoir imbibition oil recovery process experimental technique, compares with existing method, the present invention thoroughly
Have the advantage that (1) simple to operate, fracture pattern and physical dimension easily controllable；
(2) fracture pattern between different rock cores, position are reproducible；(3) rock core substrate is saturated
Degree is not made seam process influence；(4) each factor can be accurately reflected in experiment to dynamic imbibition
The impact of oil recovery process；(5) rock core repeatability is excellent.
Accompanying drawing illustrates:
Accompanying drawing 1 is the crack rock core pictorial diagram of the present invention；
Accompanying drawing 2 LOW PERMEABILITY RESERVOIR crack and substrate hand over the physical model schematic diagram that seepage flow is dynamic；
Accompanying drawing 3 is imbibition recovery ratio and the injection oil displacement agent relation curve of the present invention.
Detailed description of the invention:
The invention will be further described below in conjunction with the accompanying drawings:
This low-permeability fissured oil reservoir imbibition oil recovery process experimental technique, comprises the following steps:
(1) mould: mould is formed square dies by side plate, end plate, base plate and pressing plate, described
Square dies is that base plate top surrounding is equipped with two relative side plates and end plate, and two relatively
Side plate and end plate top be equipped with pressing plate；Its latus inframedium and end plate are steel, and base plate is electricity
Plank, pressing plate is high-density plate, and 2 side plates are connected by bolt；Square bar molding jig is several
What size: length × width × height=32cm × 32cm × 10cm；
(2) dispensing: after clear and definite matrix permeability of rock core is 2mD, according to core permeability
Determine that quartz sand consumption and cement usage ratio are respectively 87% and 13%；
(3) sand cutting: by 3480g quartz sand by stirring after, then by 385.19g asphalt mixtures modified by epoxy resin
Fat, 96.30g dibutyl phthalate, 19.26g ethylenediamine and 192.59g acetone are mixed
The cement prepared after conjunction is poured in quartz sand, stirs, sieves；Described quartzy sand grains
Degree composition percent is shown in Table 1:
Table 1 quartz sand size composition percent
| Particle diameter (mm) | 0.25～0.2 | 0.2～0.15 | 0.15～0.1 | 0.1～0.05 | 0.05～0.01 |
| Percentage ratio (%) | 1.0 | 8.0 | 42.0 | 41.0 | 8.0 |
(4) the most die-filling and pressurization: with acetone, die inside is cleaned, the sand one that will mix
Half loads in mould, moves back and forth in the horizontal direction in mould with stragith edge subsequently, this
Between also need constantly to adjust the stragith edge degree of depth, until sand is uniformly distributed, finally by pressure
Sand is compacted by plate, is placed on pressure testing machine by the mould loaded, and adjusts die location,
Keep it on forcing press bearing plate centrage, the most slowly boost to design load, surely
Pressure 15min, release；
(5) paving template interlayer: the template of design thickness is laid in the rock core pressed
On；
(6) secondary is die-filling and pressurizes: in second half loading mould of the sand that will mix, with scraping
Sand plate constantly adjusts the stragith edge degree of depth until sand is uniformly distributed, with pressing plate by sand pressure
Real, finally the mould loaded is placed on pressure testing machine, adjusts die location, make
It is maintained on forcing press bearing plate centrage, the most slowly boosts to design load, voltage stabilizing
15min, release；
(7) heat: will compacting after rock core put into baking oven, under the conditions of 85 DEG C constant temperature 6～
8h solidifies；
(8) coring: first bulk rock core is cut, subsequently according to design rock core length
From side with template for center line coring, obtain diameter 2.5cm column rock core, by column
In the middle of rock core, clamping template takes off, and obtains 2 symmetrical semicolumn rock cores, after merging
To man-made fracture rock core (as shown in Figure 1)；
(9) evacuation saturation water: rock core claims dry weight, evacuates saturation experiments water, treats saturation water
After completing, wipe out core surface water droplet with reagent paper, weigh rock core weight in wet base and calculate hole
Degree；
(10) saturated in-place oil: with politef unsintered tape by 2 semicolumn rock cores
Side (reserving end face) seals, and is then merged, in 2 semicolumn rock core sides
Between with plastic sheeting isolate because plastic sheeting itself does not have permeability, and in confined pressure power
Can fit tightly with core profile under Zuo Yong, crude oil can only pass through from rock core end face, thus
Ensure that crack rock core substrate oil saturation is not affected by crack；Merge and be placed on rock core
In clamper, adding confined pressure, saturated in-place oil also calculates oil saturation, aging 24h；
(11) dynamically imbibition experiment: removal of core from core holding unit, removes in rock core
Between plastic sheeting and the politef unsintered tape of winding, subsequently by rock core circular arc appearance
Reseal with two end faces politef unsintered tape again, only expose column rock core and split
Stitch two sides, make oil displacement agent along crack by rock core with 0.05mL/min injection rate,
Carry out dynamic imbibition experimentation, as shown in Figure 2；Add up according to the port of export the most in the same time
Oil production is dynamic imbibition recovery ratio under the conditions of calculating different injection rate, and draws corresponding plate
(see Fig. 3).
Existing experimental technique is first to carry out rock core at saturated formation water and in-place oil
Reason, then makes seam or uses three axial rock mechanics instrument applying external force to make seam rock core cutting,
Finally carry out dynamic imbibition experiment.Compared with existing experimental technique, the present invention without by
External force makes seam, sets thickness template interlayer by separately compacting rock core and laying and just may be used
Obtain crack rock core, not only simplify experimental implementation, moreover it is possible to ensure crack between different rock core
Form and position have good repeatability；By using plastics thin during saturated oils
Film and politef unsintered tape, it is ensured that substrate core oil saturation is not affected by crack,
Thus avoid external force and make the seam impact on substrate saturation；Due to rock core fracture pattern,
Size, position and rock core substrate saturation have good repeatability, and institute is in this way
Be conducive to accurately reflecting each factor impact on dynamic imbibition oil recovery process in experiment.
Above-mentioned experimental procedure (10) and (11) are all in grand celebration Toutai Oilfield Fuyu Reservoirs temperature
Carry out at 83.3 DEG C；Grand celebration Toutai Oilfield cyclopentadienyl 503 block Mao503Jing taken from by experiment oil,
At 83.3 DEG C, viscosity is 4.2mPa s；Experiment oil displacement agent is mass concentration 0.2% Davis
Surfactant solution, described Davis's surfactant is had by Dalian Davis's chemical agent
Limit company produces, effective content 40%, and preparation water is grand celebration Toutai Oilfield injected clear water.
Claims (3)
1. a Fracture with low permeability oil reservoir imbibition oil recovery experimental technique, it is characterised in that: comprise the following steps:
(1) mould: mould is formed square dies by side plate, end plate, base plate and pressing plate；
(2) dispensing: rock core makes material and is made up of quartz sand and cement, quartz sand and cement components by weight percentage:
Quartz sand 85% ~ 95%, cement 5% ~ 15%；
Described cement is made up of epoxy resin and three kinds of additive dibutyl phthalates, ethylenediamine, acetone, asphalt mixtures modified by epoxy resin
Fat and three kinds of additives are by weight ratio: epoxy resin 385.19 parts, dibutyl phthalate 96.30 parts, ethylenediamine
19.26 parts and 192.59 parts of acetone；
(3) sand cutting: according to core permeability, after quartz sand stirs, medicine needed for preparation cement is distinguished on request
Weigh, pour into after mixing in quartz sand, stir, sieve；
(4) the most die-filling and pressurization: with acetone, die inside is cleaned, the sand half that mix is loaded in mould, uses subsequently
Stragith edge moves back and forth in mould in the horizontal direction, the most also needs constantly to adjust the stragith edge degree of depth, until sand is uniformly distributed
Till, finally with pressing plate, sand is compacted, the mould loaded is placed on pressure testing machine, adjust die location so that it is keep
On forcing press bearing plate centrage, the most slowly boost to design load, voltage stabilizing 15min, release；
(5) paving template interlayer: the template of design thickness is laid on the rock core pressed；
(6) secondary is die-filling and pressurizes: in second half loading mould of the sand that will mix, constantly adjust the stragith edge degree of depth with stragith edge
Until sand is uniformly distributed, with pressing plate, sand is compacted, finally the mould loaded is placed on pressure testing machine, adjust mould
Tool position so that it is be maintained on forcing press bearing plate centrage, the most slowly boost to design load, voltage stabilizing 15min, release；
(7) heat: the rock core after compacting is put into baking oven, constant temperature 6～8h solidification under the conditions of 85 DEG C；
(8) coring: first bulk rock core is cut according to design rock core length, take for center line with template from side subsequently
Core, obtains diameter 2.5cm column rock core, is taken off by clamping template in the middle of column rock core, obtains 2 symmetrical semicolumn rock cores,
Man-made fracture rock core is obtained after merging；
(9) evacuation saturation water: rock core claims dry weight, evacuates saturation experiments water, after saturation water completes, wipes out rock core with reagent paper
Surface water droplet, weighs rock core weight in wet base and calculates porosity；
(10) saturated in-place oil: with politef unsintered tape, 2 semicolumn rock core sides are sealed, reserve 2 semicolumns
Rock core side end, is then merged and is placed in core holding unit, adds confined pressure, saturated in-place oil to calculate oil-containing saturated
Degree, aging 24h；Isolate with plastic sheeting in the middle of 2 semicolumn rock core sides；
(11) dynamically imbibition experiment: removal of core from core holding unit, removes poly-the four of rock core intermediate plastic film and winding
Fluorothene unsintered tape, reseals rock core circular arc appearance and two end faces with politef unsintered tape subsequently again, only dew
Go out Liang Ge side, column rock core crack, inject water and oil displacement agent along crack by rock core, use the method simulation fracture oil reservoir
Imbibition oil recovery process, and carry out imbibition oil recovery effect and Study on influencing factors thereof.
Fracture with low permeability oil reservoir imbibition oil recovery experimental technique the most according to claim 1, it is characterised in that: on described base plate
Portion's surrounding is equipped with two relative side plates and end plate, and two relative side plates and end plate top are equipped with pressing plate；Its latus inframedium and end
Plate is steel, and base plate is bakelite plate, and pressing plate is high-density plate.
Fracture with low permeability oil reservoir imbibition oil recovery experimental technique the most according to claim 1 and 2, it is characterised in that: described side
Shape mould size: length × width × height=32cm × 32cm × 10cm.
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